| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S. P. Penntex Energy, L.P. | Abilene, TX 79605 | Oil & Gas Operator | May 2003 |
| 3 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 4 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Mar 2025 |
| 5 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 6 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 7 | Sage Oil And Gas, LLC | Graham, TX 76450 | Gas Operator | Mar 2025 |
| 8 | Saguaro Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 9 | Salt Of The Earth Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Mar 2025 |
| 10 | Sanco Operating Company | Bullard, TX 75757 | Oil & Gas Operator | Mar 2025 |
| 11 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 12 | Sandollar Oil & Gas, Inc. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 1993 |
| 13 | Scully And Smith Oil Corporation | Salado, TX 76571 | Oil & Gas Operator | Feb 1995 |
| 14 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 15 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 16 | Sequoia Energy Resources | Dallas, TX 75207 | Oil & Gas Operator | Mar 2025 |
| 17 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 18 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 19 | Serendipity Exploration, Inc. | Weatherford, TX 76087 | Gas Operator | May 1997 |
| 20 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 21 | Sha Stephens, Incorporated | Weatherford, TX 76087 | Oil & Gas Operator | Apr 2006 |
| 22 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Mar 2025 |
| 23 | Sharoco Corporation | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 1996 |
| 24 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Mar 2025 |
| 25 | Shelley, Richard W | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2015 |
| 26 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 27 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Mar 2025 |
| 28 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 29 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 30 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 31 | Sky Development Corporation | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 32 | Sky Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 33 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 34 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Mar 2025 |
| 35 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 36 | Smith, J.V. Oil Company | Dallas, TX 75248 | Gas Operator | Mar 2025 |
| 37 | Snow Operating Co., Inc. | Haltom City, TX 76117 | Oil & Gas Operator | Feb 2024 |
| 38 | Spartagus Corporation | Grand Saline, TX 75140 | Oil & Gas Operator | Sep 2004 |
| 39 | Spence Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 40 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 41 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 42 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 43 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 44 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 45 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 46 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 47 | Star Operating, Inc | Fort Worth, TX 76185 | Oil & Gas Operator | Mar 2025 |
| 48 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 49 | Steller Energy & Investment Corp | Plano, TX 75093 | Oil & Gas Operator | Feb 2021 |
| 50 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 51 | Stephens Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Feb 2022 |
| 52 | Stephens, Clayton E. | Dallas, TX 75229 | Oil & Gas Operator | Nov 2011 |
| 53 | Stephens, Hayseed Oil Inc. | Weatherford, TX 76087 | Oil & Gas Operator | Mar 2008 |
| 54 | Stephens, Morris | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 55 | Sterling Oil And Gas | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 56 | Stewart & Porter | Mingus, TX 76463 | Oil & Gas Operator | Apr 2002 |
| 57 | Stivers Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 1995 |
| 58 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 59 | Stone Creek Operating, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 60 | Stonebriar Oil LLC | Frisco, TX 75034 | Oil & Gas Operator | Mar 2025 |
| 61 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 62 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 63 | Street, Spencer B., Jr. | Graham, TX 76450 | Oil & Gas Operator | Mar 1998 |
| 64 | Sun-Key Oil Co., Inc. | Dublin, TX 76446 | Oil & Gas Operator | Mar 2025 |
| 65 | Sunrise Oil, LTD. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2004 |
| 66 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Mar 2025 |
| 67 | Swan PC, LP | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 68 | Swan Production Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Nov 2009 |
| 69 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Mar 2025 |
| 70 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |